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Mon, 11 May 2020 14:47:46 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8693CC605A; Mon, 11 May 2020 14:47:46 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8A88DC6055; Mon, 11 May 2020 14:47:45 +0000 (GMT) Received: from localhost.localdomain (unknown [9.85.196.245]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTPS; Mon, 11 May 2020 14:47:45 +0000 (GMT) Subject: Re: [PATCH v1 2/8] s390/sclp: check sccb len before filling in data To: David Hildenbrand , Janosch Frank , qemu-devel@nongnu.org, qemu-s390x@nongnu.org References: <20200508230823.22956-1-walling@linux.ibm.com> <20200508230823.22956-3-walling@linux.ibm.com> <58bc496c-28bb-26f8-ab46-aba6ad141717@linux.ibm.com> <737869a8-13b2-1831-00c6-629d5a109d9c@redhat.com> From: Collin Walling Message-ID: <11b5fdaa-9019-0740-b3de-a605bf7f476f@linux.ibm.com> Date: Mon, 11 May 2020 10:47:44 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <737869a8-13b2-1831-00c6-629d5a109d9c@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-11_06:2020-05-11, 2020-05-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 adultscore=0 mlxscore=0 malwarescore=0 mlxlogscore=963 phishscore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005110112 Received-SPF: pass client-ip=148.163.156.1; envelope-from=walling@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/11 10:37:41 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, KHOP_DYNAMIC=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mst@redhat.com, cohuck@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, svens@linux.ibm.com, pbonzini@redhat.com, mihajlov@linux.ibm.com, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 5/11/20 10:44 AM, David Hildenbrand wrote: > On 11.05.20 16:36, Janosch Frank wrote: >> On 5/9/20 1:08 AM, Collin Walling wrote: >>> The SCCB must be checked for a sufficient length before it is filled >>> with any data. If the length is insufficient, then the SCLP command >>> is suppressed and the proper response code is set in the SCCB header. >>> >>> Signed-off-by: Collin Walling >> >> Fixes tag? >> Reviewed-by: Janosch Frank > > This is not a fix AFAIKs. > sclp_service_call()/sclp_service_call_protected() always supplies a full > SCCB of exactly 4k size. > > Right. This is more-or-less a preparation patch for the extended-length SCCB stuff which allows an SCCB > 4k. The Linux kernel always provides a 4k SSCB today, so this patch more-or-less makes the code AR compliant. -- -- Regards, Collin Stay safe and stay healthy